Following advice received in this thread, I have produced a design for a simpler layout as a starting project.   This is a track layout for a four platform main line through station intended to be set on the Western region during the late 1980s/early 1990s. The platforms and fiddle yards at both ends are intended to take 8 carriage HSTs, and the carriage sidings (for trains terminating in the down direction) are intended to be able to take a mixture of diesel multiple units and 6-carriage rake